[FlopCpp] Index of the constraint

[Tim Hultberg]

Hi,

the mailing list is not used very often, but you picked the right one. 

I can try to help if you send me the full example that you say compiles. (are you sure that MP_constraint hh(i,4,dim+1); compiles? It shouldn't)

Anyway I can see a problem in the next lines. The constraints in Flopc++ are symbolic expression trees - the actual coefficients are only generated at the end. Therefore when you write
hh(i, n, dim + 1) = ...
hh(i, m, dim + 1) = ...
only the last expression is kept. (for the same reason a for loop does not seem to be the way to go) Maybe a solution to your problem is simply to have two different symbolic constraints.

Cheers, Tim

________________________________________
From: FlopCpp [flopcpp-bounces at coin-or.org] On Behalf Of Guyves Achtari [11ga10 at queensu.ca]
Sent: 10 October 2015 00:39
To: flopcpp at list.coin-or.org
Subject: [FlopCpp] Index of the constraint

Hi,

It seems like this mailing list is inactive. I have the following question. Perhaps someone can redirect me to the right group:

Using Flopc++, I would like to create sub sets that I can use for multiple constraints:

Example constraint:

MP_constraint

hh(i,4,dim+1);


hh(i, n, dim + 1) = h(n, dim + 1) == c(i, n, dim + 2) - c(i, n + 1, dim + 2) ;

hh(i, m, dim + 1) = h(m, dim + 1) == c(i, m, dim + 2) - c(i, m + 1, dim + 2) ;

with for example n between [0..1] and m[2..3]. Is this possible?

If not, can I simply use a for loop? It seems to compile but the results are not coherent..

Thanks for any suggestions..

Best,

G

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